first, do you know that the Hangtime board works? if it does, is your +5 voltage set right? I don't know all the tolerances, but there's a chance an NBA Jam (T-unit) board can run with lower voltage vs. a Hangtime (Wolf unit) board, thus rendering it unable to boot.
other than that, I don't know what to tell you. either the board's no good or your power supply isn't adjusted right. you might want to check the JAMMA edge on the Hangtime board and make sure the contacts aren't extremely dirty and fudged up. you can clean this with a regular pencil eraser on the small portion of the JAMMA edge (where the power wiring goes) making sure not to get the rubber shavings into the board, frequently wipe them away.